fix: honor Whisper provider proxy

[casama233]

Modifications / 改动点

• Pass the configured provider proxy to the Whisper STT OpenAI client.
• Add regression coverage for proxy-aware client construction.
• This is NOT a breaking change.

Screenshots or Test Results / 运行截图或测试结果

• python -m pytest -q /tmp/test_whisper_api_source.py: 2 passed.
• python -m ruff check ...: All checks passed.

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Checklist / 检查清单

• No new feature is introduced.
• The change was tested and verification results are provided above.
• No new dependencies are introduced.
• The change does not introduce malicious code.

Summary by Sourcery

Route Whisper API requests through the provider-configured proxy and verify the client configuration.

Bug Fixes:

• Honor the configured provider proxy when constructing the OpenAI Whisper STT client.

Tests:

• Add regression coverage verifying that the configured proxy HTTP client is passed to the Whisper client.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. If proxy construction or selection is wrong, Whisper audio and the API credential may be sent through an unintended intermediary, exposing data or access that a revert cannot undo. Reverting stops future requests from using the proxy, but it cannot retract requests already transmitted.

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